TOREX XC6371, XC6372 User Manual

A

XC6371/XC6372

Series

ETR0402_004

PWM,PWM/PFM Controlled Step-up DC/DC Converters

■GENERAL DESCRIPTIO N

The XC6371/XC6372 series is a group of PWM controlle d and PWM/PFM controll ed step-up DC/DC converters. T he built-in

1.4Ω switching transistor type enables a step-up circuit to be configured using only three compone nts, a coil, a diode, and a
capacitor.
Output voltage can be selectable in the range from 2.0V to 7.0V in increments of 0.01V (accuracy:±2.5%). Oscillation
frequency is also selectable from 50kHz, 100kHz, and 180kHz (accuracy: ±15%) for the XC6371 and the XC6372 series.
Soft-start time is internally set and offers protection against in-rush currents when the power is switched on and pr events
voltage overshoot. Packages with CE (chip enable) pin are also available which can reduce the IC power consumption
during during stand-by mode.
The XC6371 series is the standard PWM controlled products. The control of the XC6372 series switches from PWM to PFM
control during light loads when automatically switching is selected and the series is highly efficient from light loads to large
output currents.

■

PPLICATIONS

●Cellular phones, Pagers

●Palmtops

●Cameras, Video recorders

●Portable products

■FEATURES

Operation Start Voltage Range
Output Voltage Range : 2.0V~7.0V (0.1V increments)
Highly Accurate : ±2.5%
Oscillation Frequency :
Maximum Output Currents
Highly Efficient : 85%(TYP.) @ V
Built-in switching transistor.
CE pin type (XC6371C, XC6372C)
Phase compensation and soft start-up circuits built-in
CMOS Low Power Consumption
Packages : SOT-89, SOT-89-5, USP-6B
Environmentally Friendly: EU RoHS Compliant, Pb Free

* Performance depends on external components and PCB layout.

■

TYPICAL APPLICATION CIRCUIT

■TYPICAL PERFORMANCE

☆GreenOperation Compatible

: 0.9V~10V

50kHz, 100kHz, 180kHz (±15%)

: 100mA(TYP.) @ VIN=3.0V, VOUT=5.0V *

IN=3.0V, VOUT=5.0V *

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XC6371/XC6372

■PIN CONFIGURATION

Series

■PIN ASSIGNMENT

XC6371/XC6372A

PIN NUMBER

SOT-89 USP-6B

PIN NAME FUNCTION

*The dissipation pad for the USP-6B
package should be solder-plated in
recommended mount pattern and metal
masking so as to enhance mounting
strength and heat release. If the pad needs
to be connected to other pins, it should be
connected to the pin No.1.

1 6 VSS Ground
2 1 VOUT

Output Voltage Monitor/IC Internal Power Supply

3 4 Lx Switch

－

XC6371/XC6372C

SOT-89-5 USP-6B

PIN NUMBER

2, 3, 5 NC No Connection

PIN NAME FUNCTION

5 6 VSS Ground
2 1 VOUT Output Voltage Monitor/IC Internal Power Supply
4 4 Lx Switch
3 3 CE Chip Enable
1 2, 5 NC No Connection

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r

■PRODUCT CLASSIFICATION

●Selection Guide

START

PWM XC6371

Standard

Chip Enable

PWM/PFM XC6372

Standard

Chip Enable

●Ordering Information

XC6371①②③④⑤⑥-⑦
XC6372①②③④⑤⑥-⑦

DESIGNATOR DESCRIPTION SYMBOL DESCRIPTION

①

(*1)

: PWM controlled

(*1)

: PWM/PFM switching control

Type of

DC/DC Converter

A 3-pin DC/DC converter with built-in switching transistor
C Stand-by capability with built-in switching transistor

XC6371/XC6372

Series

XC6371A

XC6371C

XC6372A

XC6372C

②③

Output Voltage Integer

OUT=3.5V→②=3, ③=5

e.g. V

0 50kHz

④

Oscillation Frequency

1 100kHz
2 180kHz

SOT-89 (XC6371/72 A type)
SOT-89-5 (XC6371/72 C type)
SOT-89 (XC6371/72 A type)
SOT-89-5 (XC6371/72 C type)

⑤⑥-⑦

Packages

Taping Type

(*2)

PR

PR-G

DR USP-6B

DR-G USP-6B

(*1)

The “-G” suffix indicates that the products are Halogen and Antimony free as well as being fully RoHS compliant.

(*2)

The device orientation is fixed in its embossed tape pocket. For reverse orientation, please contact your local Torex sales office o

representative. (Standard orientation: ⑤R-⑦, Reverse orientation: ⑤L-⑦)

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A

(p)

XC6371/XC6372

■BLOCK DIAGRAMS

XC6371/XC6372A, C

■

OUT pin serves also as VDD)

(The V

Lx

VLx li miter

Buffer

V

SS

EXT

Note: The CE pin is only used with the XC6371C.

PWM Control

OSC 50/100 /180KHz

Chip Enable

XC6371/72/73E

Lx

Buffer

V

SS

EXT

Note: Built-in transistor type units use the Lx pin.

PWM Control

OSC 50/100 /180KHz

BSOLUTE MAXIMUM RATINGS

PARAMETER SYMBOL RATINGS UNITS

VOUT Input Voltage VOUT 12 V

LX pin Voltage VLX 12 V

LX pin Current ILX 400 mA

CE Input Voltage VCE 12 V

SOT-89,

Power Dissipation

VDD Input Voltage VDD 12 V

Operating Temperature Range Topr

Storage Temperature Range Tstg

SOT-89-5

USP-6B

Series

CE

VLx limiter

Soft Start

Vref

Phase co mp

+

－

Soft S tart

Vref

Phase comp

－

+

Pd

DD

V

V

OUT

V

DD

V

DD

V

OUT

Ta=25℃

500

mW

100

-30~＋80 ℃

-40~＋125 ℃

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,

XC6371/XC6372

Series

■ELECTRICAL CHARACTERISTICS

XC6371/72A501

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

Output Voltage VOUT 4.875 5.000 5.125 V
Maximum Input Voltage VIN 10 - - V
Operation Start Voltage VST1 External Components Connected, IOUT=1mA - - 0.90 V

Oscillation Start Voltage VST2

No Load Input Current IIN

Supply Current 1 IDD1

Supply Current 2 IDD2

Lx Switch-On

Resistance

Lx Leak Current ILXL No external components. VOUT=VLX=10V - - 1.0

Oscillation Frequency FOSC Same as IDD1. Measuring of Lx waveform 85 100 115 kHz

Maximum Duty Ratio MAXDTY Same as IDD1. Measuring of Lx waveform 80 87 92 %

PFM Duty Ratio

Lx Limit Voltage VLXLMT

Efficiency EFFI - 85 - %

Slow-Start Time TSS 4.0 10.0 20.0 ms

NOTE: Unless otherwise stated, VIN=VOUT×0.6, IOUT=50mA. See Typical Application Circuits, Circuit1

*1: The Schottky diode (SD) must be type MA735, with reverse current (IR)<1.0μA at reverse voltage (VR)=10.0V.(XC6372A)
*2: "Supply Current 1" is the supply current while the oscillator is continuously oscillating. In actual operation the oscillator periodically

operates which results in less average power consumption. The current actually provided by an external V
"No Load Input Current (I

*3: When PWM operates at PWM Mode.
*4: When PFM operates at PFM Mode.(XC6372A)

OUT=5.0V

V

FOSC=100kHZ

No external components. Apply voltage to VOUT

Lx : 10kΩ pull-up to 5V

IN=VOUT×0.8, IOUT=0mA

V

(*1)

Same as VST2,

Apply output voltage×0.95 to VOUT

Same as VST2,

Apply output voltage×1.1 to V

OUT

Ta=25℃

- - 0.80 V

- 12.8 25.7

- 80.2 133.8

- 8.2 16.5

RSWON Same as IDD1, VLX=0.4V - 1.4 2.4

(*4)

PFMDTY Same as IDD1. Measuring of Lx waveform 10 17 25 %

Same as IDD1. Apply output voltage to Lx,

Voltage required to produce FOSC×2

IN)".

0.7 - 1.3 V

IN source is represented by

μA
μA

μA

Ω

μA

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)

XC6371/XC6372

■ELECTRICAL CHARACTERISTICS (Continued

XC6371/72C501

Series

V

OUT=5.0V, FOSC=100kHz Ta=25℃

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

Output Voltage VOUT 4.875 5.000 5.125 V
Maximum Input Voltage VIN 10 - - V
Operation Start Voltage VST1 External Components Connected, IOUT=1mA - - 0.90 V

Operation Start Voltage VST2

No Load Input Current IIN

Supply Current 1 IDD1

Supply Current 2 IDD2

Lx Switch-On

Resistance

R

SWON Same as IDD1, VLx=0.4V - 1.4 2.4

Lx Leak Current ILXL No external components, VOUT =VLX=10V - - 1.0

No external components. Apply voltage to VOUT,

Lx : 10kΩ pull-up to 5V

IN=VOUT×0.8, IOUT=0mA

V

(*1)

Same as VST2,

Apply output voltage×0.95 to VOUT

Same as V

Apply output voltage×1.1 to V

ST2,

OUT

- - 0.80 V

- 12.8 25.7

- 80.2 133.8

- 8.2 16.5

μA
μA

μA

Ω

μA

Oscillation Frequency FOSC Same as I DD1, Measuring of Lx waveform 85 100 115 kHZ

Maximum Duty Ratio MAXDTY Same as IDD1, Measuring of Lx waveform 80 87 92 %

PFM Duty Ratio

Stand-by Current ISTB Same as IDD1 - - 0.5

(*4)

PFMDTY Same as IDD1, Measuring of Lx waveform 10 17 25 %

μA

CE "High" Voltage VCEH Same as IDD1, Lx Oscillation start 0.75 - - V

CE "Low" Voltage VCEL Same as IDD1, Lx Oscillation stop - - 0.20 V

CE "High" Current ICEH

Same as I

DD1, VCE=VOUT×0.95

CE "Low" Current ICEL Same as IDD1, VCE=0V - - -0.25

Lx Limit Voltage VLxLMT

Same as IDD1, Apply output voltage to Lx,

Voltage required to produce FOSC×2

- - 0.25

μA
μA

0.7 - 1.3 V

Efficiency EFFI - 85 - %

Slow-Start Time TSS 4.0 10.0 20.0 ms

NOTE: Unless otherwise stated, connect CE to VOUT, VIN=VOUT×0.6, IOUT=50mA. See Typical Application Circuits, Circuit 2.

*1: The Schottky diode (SD) must be type MA735, with reverse current (I
*2: "Supply Current 1" is the supply current while the oscillator is continuously oscillating. In actual operation the oscillator periodically

operates which results in less average power consumption. The current actually provided by an external VIN source is represented by

"No Load Input Current (I
*3: When PWM operates at PWM Mode.
*4: When PFM operates at PFM Mode.(XC6372C)

IN)".

R)<1.0μA at reverse voltage (VR)=10.0V.(XC6372C)

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